The microtensile bond strength test: Its historical background and application to bond testing

Abstract

SummaryMicrotensile bond strength (μTBS) test was introduced in 1994. Since then, it has been utilized profoundly across many bond strength testing laboratories, making it currently one of the most standard and versatile bond strength test. Although it is a static and strength-based method, together with the morphological and spectroscopic investigations, it has been contributing immensely in the advancement of dentin adhesive systems. μTBS test has a greater discriminative capability than the traditional macro-shear bond test. During the early stage of its development, the authors predicted that this testing method would enable evaluation of the adhesive performances of resins to excavated carious or sclerotic dentin and the regional bond strengths of various portions of the cavity. In addition, they also stated the possibility of comparing the long-term stability of resin adhesion at various portions of the cavity walls on teeth extracted at various times after insertion of bonded restorations. In this review, we discussed the historical background, inception and the application of the μTBS test and proposed directions for further improvement of this testing method.

Bonding Performance of a Hydrophilic Amide Monomer Containing Adhesive to Occlusal and Cervical Dentin

“…The collected teeth were stored following the approval of the committee of Ethics at Hokkaido University (#2013-7). Extracted teeth were stored following the guideline [14] until the experiment. The teeth were stored at 4 • C in 0.5% chloramine-T aqueous solution and used within 4 months after extraction.…”

“…Bond strength testing was exactly following the procedure described in the previous reports [17]. The load at failure was recorded in Newtons and divided by the bonding surface area in square mm to calculate the bond strength in MPa [14,18]. Statistical analyses for the four groups were conducted using a two-way analysis of variance (ANOVA) test (p = 0.05)…”

“…Bond strength testing was exactly following the procedure described in the previous reports [17]. The load at failure was recorded in Newtons and divided by the bonding surface area in square mm to calculate the bond strength in MPa [14,18]. Statistical analyses for the four groups were conducted using a two-way analysis of variance (ANOVA) test (p = 0.05) Japan) were built on the surface using a light emitting diode light-curing device (Pencure 2000; Morita, Tokyo, Japan) for 40 s. The number of specimens for each of the four groups (two adherends × two adhesives) was three.…”

Effects of remaining dentin thickness, smear layer and aging on the bond strengths of self-etch adhesives to dentin

“…The bonding of universal adhesives to enamel showed reliable outcomes 4) . However, the humid and organic nature of dentin puts inherent challenges to bonding, primarily due to an increase in the number of tubules and consequent increase in dentin wetness and permeability [13][14][15] , when deep dentin (i.e., thin remaining dentin thickness) is approached. In coronal dentin, the number of tubules per area varies from 8,000 (superficial or thick remaining dentin) to 58,000/ mm 2 (deep or thin remaining dentin).…”

Modified Microtensile Bond Strength of Glass Ionomer to Composite Resin Using Universal Adhesive in Self-etch and Total-etch Modes

“…However, the microtensile test has some drawbacks as well such as the induction of micro-cracks in the samples as a result of sectioning, higher technical demands, and underestimating the bond strength [15]. Sano et al [16] discussed that pre-test failure is an important problem when using an adhesive with low microtensile bond strength. Thus, we designed a modified microtensile bond strength test for the evaluation of bond strength without sectioning the samples in this study.…”